diff --git a/src/inc/taosmsg.h b/src/inc/taosmsg.h
index 78255a45d5432fffe3ea0d2daf87d94dff041e42..c8bd2c60769ca80eec1d6ac1f2fd390719e367bf 100644
--- a/src/inc/taosmsg.h
+++ b/src/inc/taosmsg.h
@@ -618,7 +618,7 @@ typedef struct {
 } SMDVnodeDesc;
 
 typedef struct {
-  char db[TSDB_DB_NAME_LEN];
+  char db[TSDB_ACCT_LEN + TSDB_DB_NAME_LEN];
   SMDVnodeCfg  cfg;
   SMDVnodeDesc nodes[TSDB_MAX_REPLICA];
 } SMDCreateVnodeMsg;
diff --git a/src/mnode/inc/mnodeDef.h b/src/mnode/inc/mnodeDef.h
index ae1ba98a0f4a15d37824de71e5db81c73effa89c..46d2675705e5b7dc0ee53ba8db8f62a9ad5046df 100644
--- a/src/mnode/inc/mnodeDef.h
+++ b/src/mnode/inc/mnodeDef.h
@@ -132,7 +132,7 @@ typedef struct SVgObj {
   int64_t        createdTime;
   int32_t        lbDnodeId;
   int32_t        lbTime;
-  char           dbName[TSDB_DB_NAME_LEN];
+  char           dbName[TSDB_ACCT_LEN + TSDB_DB_NAME_LEN];
   int8_t         inUse;
   int8_t         accessState;
   int8_t         reserved0[5];
diff --git a/src/mnode/src/mnodeVgroup.c b/src/mnode/src/mnodeVgroup.c
index 36fa306c9f5180e1a7fac51424740ab5b6b30cd0..b314bfc8d03689842e33bdbbe9f5197a3bd9f6ca 100644
--- a/src/mnode/src/mnodeVgroup.c
+++ b/src/mnode/src/mnodeVgroup.c
@@ -358,7 +358,7 @@ int32_t mnodeCreateVgroup(SMnodeMsg *pMsg, SDbObj *pDb) {
   if (pMsg == NULL) return TSDB_CODE_MND_APP_ERROR;
 
   SVgObj *pVgroup = (SVgObj *)calloc(1, sizeof(SVgObj));
-  tstrncpy(pVgroup->dbName, pDb->name, TSDB_DB_NAME_LEN);
+  tstrncpy(pVgroup->dbName, pDb->name, TSDB_ACCT_LEN + TSDB_DB_NAME_LEN);
   pVgroup->numOfVnodes = pDb->cfg.replications;
   pVgroup->createdTime = taosGetTimestampMs();
   pVgroup->accessState = TSDB_VN_ALL_ACCCESS;